Per the OPs request...
https://tstage9.wixsite.com/nyc-modeling
Time...It marches on...without ever turning around to see if anyone is even keeping in step.
SeeYou190 cuyama Extend the centerline of the roundhouse tracks. Where they cross is the center of the turntable. I'm pretty sure that anything else won't line up. Byron gave the best and correct answer near the top of the first page. -Kevin
cuyama Extend the centerline of the roundhouse tracks. Where they cross is the center of the turntable. I'm pretty sure that anything else won't line up.
Byron gave the best and correct answer near the top of the first page.
-Kevin
Rich
Alton Junction
cuyamaExtend the centerline of the roundhouse tracks. Where they cross is the center of the turntable. I'm pretty sure that anything else won't line up.
Living the dream.
Lastspikemike It's not useful because it doesn't matter. You just don't need to know that information. , The roundhouse determines all the other distances. You place the template of the roundhouse stall right on your layout (or draw it on your plan). Draw two lines and you're done.
It's not useful because it doesn't matter. You just don't need to know that information. ,
The roundhouse determines all the other distances.
You place the template of the roundhouse stall right on your layout (or draw it on your plan). Draw two lines and you're done.
richhotrain Of course the formula is not necessary, but it is useful, and it certainly is helpful.
Agree 100%
Lastspikemike The formula is unnecessary. The footprint of the turntable and roundhouse is determined by the roundhouse. The dimension you need is the distance from the back wall of the roundhouse to the center of the turntable. You never need to know the component dimensions used in that formula just to install the roundhouse and turntable. I would say the formula is handy if you're drawing a layout plan. Otherwise it is not helpful.
The formula is unnecessary. The footprint of the turntable and roundhouse is determined by the roundhouse. The dimension you need is the distance from the back wall of the roundhouse to the center of the turntable. You never need to know the component dimensions used in that formula just to install the roundhouse and turntable.
I would say the formula is handy if you're drawing a layout plan. Otherwise it is not helpful.
So, when JDawg in the other thread asks...
JDawg I am trying to plan for a roundhouse/turntable on my condo layout. I am looking at the walthers 90ft and the matching roundhouse. How much space is there between the Turntable and the roundhouse. How much space should I plan for?
I am trying to plan for a roundhouse/turntable on my condo layout. I am looking at the walthers 90ft and the matching roundhouse. How much space is there between the Turntable and the roundhouse. How much space should I plan for?
I still think that building a 1:1 Mock Up is time well spent just to be 100% sure.
Lastspikemike The formula is useful if you're drawing a layout plan. If you actually have a layout and a roundhouse or kit for one you just need two lines on your layout. Take the longest floor piece for one stall. Place that floor piece on your layout. Mark the back wall position of the roundhouse. Draw two converging lines, one along each long side of that roundhouse stall floor piece. Where they intersect will be the center of your turntable. It doesn't matter how big the roundhouse is, how wide the doors are nor how large the turntable is. The location of the back wall of the longest roundhouse stall determines the location of the center of the turntable. That point depends only on the angle of the stalls.
The formula is useful if you're drawing a layout plan.
If you actually have a layout and a roundhouse or kit for one you just need two lines on your layout.
Take the longest floor piece for one stall. Place that floor piece on your layout. Mark the back wall position of the roundhouse. Draw two converging lines, one along each long side of that roundhouse stall floor piece. Where they intersect will be the center of your turntable.
It doesn't matter how big the roundhouse is, how wide the doors are nor how large the turntable is. The location of the back wall of the longest roundhouse stall determines the location of the center of the turntable. That point depends only on the angle of the stalls.
Also, at least on the Walthers Cornerstone roundhouse, all of the stalls are the same length. Some kits include a few extensions for longer locomotives, but it is sufficient to measure the length of the standard stall.
The data derived from the formula is also useful in determining overall space for both the roundhouse and turntable. For example, using the 130' turntable and the Walthers Cornerstone Roundhouse, a space of 38.5" would be required from the back of the roundhouse to the far edge of the turntable. A space of 26.3" would be required if using the 90' turntable.
MacTromOn my next layout, I’m kitbashing the two HelJan houses I have, and with parts from another, building a 14 stall house with 4 deepened stalls for longer engines, as well as adding a side building for office/supplies/loading.
That sounds like an interesting kit conversion project.
I hope you can share pictures. Please keep us updated.
7j43k richhotrain Ed, any chance you can publish that formula for all of us to reference. Rich ((b X c) / (a - b)) - d a = one half of width of rear wall of one stall b = one half of width of front wall of one stall c = distance from rear wall to front wall (NOT length of roundhouse wall) d = radius of pit Ed
richhotrain Ed, any chance you can publish that formula for all of us to reference. Rich
Ed, any chance you can publish that formula for all of us to reference.
((b X c) / (a - b)) - d
a = one half of width of rear wall of one stall
b = one half of width of front wall of one stall
c = distance from rear wall to front wall (NOT length of roundhouse wall)
d = radius of pit
Ed
Interesting conversation, and the math behind it.
I like the old HelJan roundhouse, primarily because of the set back from the pit. It just looks more prototypical to me. When I was placing it, for a six bay house, I put long track pieces into the two outer bays and use them to line up to the turntable, moving the house back until it fit right. Took only a few minutes of testing.
On my next layout, I’m kitbashing the two HelJan houses I have, and with parts from another, building a 14 stall house with 4 deepened stalls for longer engines, as well as adding a side building for office/supplies/loading.
well a huge thank you to all who chipped in here. im in the process of building the three stall roundhouse kit with the 130' tt and of course came upon this very question. just eyeballing it I figured about 3", so the ~2.7" from the braniacs here was very encouraging indeed.
thanks again...great source/resource for information
The formula calls for using the distance between the front and rear walls, not the length of the side wall.
If the length of the side wall is 17.625", and the angular track spacing is 10 degrees, then the distance between the front and rear walls will be 17.555".
RR_Mel...I built my Korber kit 18 years ago back when it cost $40....
I'm not sure, Mel, but I think that mine sat in its box even longer than that.
Wayne
I used two pieces of flex track. I made them as straight as possible and put them into the outer engine stalls. I centered them inside the stalls and where they intersected became the center of the pit. Everything worked out fine.
In this picture, some of the tracks don't line up correctly. The track was not attached to the base and I knocked them out of whack trying to get the engines on the tracks. Anyone with arthritis in their hands will understand.
7j43k richhotrain 7j43k There's a relatively simple formula for calculating the distance from the roundhouse to the pit. Ed, any chance you can publish that formula for all of us to reference. Rich ((b X c) / (a - b)) - d a = one half of width of rear wall of one stall b = one half of width of front wall of one stall c = distance from rear wall to front wall (NOT length of roundhouse wall) d = radius of pit Ed
richhotrain 7j43k There's a relatively simple formula for calculating the distance from the roundhouse to the pit. Ed, any chance you can publish that formula for all of us to reference. Rich
7j43k There's a relatively simple formula for calculating the distance from the roundhouse to the pit.
There's a relatively simple formula for calculating the distance from the roundhouse to the pit.
7j43k I believe that the distance to the pit in the above drawing (2.5986) should be 2.7966. Assuming all the other dimensions are accurate.
I believe that the distance to the pit in the above drawing (2.5986) should be 2.7966. Assuming all the other dimensions are accurate.
7j43k richhotrain 7j43k There's a relatively simple formula for calculating the distance from the roundhouse to the pit. Ed, any chance you can publish that formula for all of us to reference. Rich ALL? Right.
ALL? Right.
RR_Mel Rich I could make you a CAD drawing if you Post or send me the stall width measured at the doors. EDIT: Include the stall depth too.
For what it is worth, the overall diameter of the turntable is 19 1/8", and the diameter of the pit is 18 1/4".
Your photo of the Korber roundhouse looks great, Mel!
I could have sent you some wall sections for lengthening the stalls, as I shortened four of mine by 1 1/2 panels, and shortened the other one down to just two panels. The longest loco using the roundhouse is a Bachmann USRA Light Mountain, which fits easily in the longer stalls, while I have some Moguls and Ten Wheelers that can use the short stall....
I put the roundhouse together using Weldbond epoxy, in conjuction with machine screws. as some of the walls were badly warped (the kit had been sitting, unbuilt, for several years)...
I'll add trusses to the top of the posts shown in the overhead view, but make them part of a one-piece removeable roof. I've ordered some Grandt Line doors, but they won't be operated remotely, as the roundhouse is almost at the edge of the upper level of my layout.
I also used some parts, left-over from a Walthers kit, to add a small annex to the rear of the building...
SeeYou190 We had 100% success with no math.
We had 100% success with no math.
I had 100% success WITH math.
And it only took about 3 minutes. For one person. Without a roundhouse or turntable.
I have only lined up one roundhouse with a turntable in all my layout building experience. It was in N scale for a friend's N&W layout.
First we figured out where the turntable center would be.
The roundhouse stalls were 12 degrees I believe. We drew a bunch of lines at 12 degree seperations from the turntable center.
Then we mounted the turntable in the correct spot using yellow string to get the center correct. This was before lasers for homeowners.
Then we mounted the roundhouse so all the track center lines were on the lines we drew previously.
I've got a Korber roundhouse, with five stalls, and the Walthers 90' turntable. The front wall of the roundhouse is 9" from the inner edge of the turntable pit for the two outermost stalls, and about 9.125" for the three inner stalls. The roundhouse isn't yet permanently installed, but the positions of the house tracks at the turntable can be easily adjusted. I've motorised the turntable using the motor and gearbox from a scanner, and am running it with a surplus SCR throttle, powered by a 9VAC wall-wart. Indexing is "by-eye", so any variations in the positioning of the house tracks at the pit shouldn't be an issue...